how does the stemof a plant when cat and planted into the soil grow into a new plant in the absence of roots
Answers
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A plant cutting is a piece of a plant that is used in horticulture for vegetative (asexual) propagation. A piece of the stem or root of the source plant is placed in a suitable medium such as moist soil. If the conditions are suitable, the plant piece will begin to grow as a new plant independent of the parent, a process known as striking. A stem cutting produces new roots, and a root cutting produces new stems. Some plants can be grown from leaf pieces, called leaf cuttings, which produce both stems and roots. The scions used in grafting are also called cuttings.
Propagating plants from cuttings is an ancient form of cloning.There are several advantages of cuttings, mainly that the produced offspring are practically clones of their parent plants. If a plant has favorable traits, it can continue to pass down its advantageous genetic information to its offspring. This is especially economically advantageous as it allows commercial growers to clone a certain plant to ensure consistency throughout their crops.
The poet Theodore Roethke wrote about plant cuttings and root growth behavior in his poems "Cuttings" and "Cuttings (Later)" found in his book The Lost Son: And Other Poems.
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Answer:
ome plants form roots much more easily than others. Stem cuttings from woody plants are treated differently, depending on the maturity of the wood:
Softwood cuttings come from stems that are rapidly expanding, with young leaves. In many species, such cuttings form roots relatively easily.[13][14]
Semi-hardwood cuttings come from stems that have completed elongation growth and have mature leaves.
Hardwood cuttings come from fully matured stems, and are often propagated while dormant.
Most plant cuttings are stem pieces, and have no root system of their own, they are likely to die from dehydration if the proper conditions are not met. They require a moist medium, which, however, cannot be too wet lest the cutting rot. A number of media are used in this process, including but not limited to soil, perlite, vermiculite, coir, rock wool, expanded clay pellets, and even water given the right conditions. Most succulent cuttings can be left in open air until the cut surface dries, which may improve root formation when the cutting is later planted.
In temperate countries, stem cuttings may be taken of soft (green or semi-ripe) wood and hard wood which has specific differences in practice. Certain conditions lead to more favorable outcomes for cuttings; timing, size, location on the plant, and amount of foliage are all important. Stem cuttings of young wood should be taken in spring from the upper branches, while cuttings of hardened wood should be taken in winter from the lower branches. Common bounds on the length of stem cuttings are between 5–15 centimetres (2.0–5.9 in) for soft wood and between 20–25 centimetres (7.9–9.8 in) for hard wood. Soft wood cuttings do best when about two thirds of the foliage removed,[15] while hard wood stem cuttings need complete foliage removal. The cut needs to be done either immediately below a node[16], or upto 1/2 inch below a node[17].
The environment for cuttings is generally kept humid—often attained by placing the cuttings under a plastic sheet or in another confined space where the air can be kept moist—and partial shade to prevent the cutting from drying out. Cuttings in the medium are typically watered with a fine mist to avoid disturbing plants. Following the initial watering, the aim to keep the soil moist but not wet and waterlogged; the medium is allowed to almost dry out before misting again.[15]
A rooting hormone may be administered to "encourage" growth and can increase the success rate of plant growth.[18] Though not essential, several compounds may be used to promote the formation of roots through the signaling activity of plant hormone auxins. Among the commonly used chemicals is indole-3-butyric acid (IBA) used as a powder, liquid solution or gel. This compound is applied either to the cut tip of the cutting or as a foliar spray. Rooting hormone can be manufactured naturally, such as soaking the yellow-tipped shoots of a weeping willow tree in water or to preparing a tea from the bark of a willow tree. Shoots or bark do better when soaked for 24 hours prior to using.[19] The extract obtained from the crushing of leaves and bulbs of coco-grass (Cyperus rotundus) is used as an excellent rooting of cuttings and seedlings of various plant species.[20][21] Honey, though it does not contain any plant hormones, can also aid in rooting success through its natural antiseptic and antifungal properties.[22][23] Cinnamon[citation needed] or an Aspirin tablet in water[24], can also aid the rooting process.[25]
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